package collection;

import java.util.ArrayList;
import java.util.List;

/**
 * 获取子集
 */
public class ListDemo3 {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            list.add(i);
        }
        System.out.println(list);
        /*
            获取2-7
            List subList(int start,int end)
            获取当前集合指定范围内的子集
         */
        List<Integer> subList = list.subList(2,8);
        System.out.println(subList);

        //将子集每个元素扩大10倍
        for(int i=0;i<subList.size();i++){
            int num  = subList.get(i);
            num = num * 10;
            subList.set(i,num);
        }
        //[20,30,40,50,60,70]
        System.out.println(subList);
        /*
            对子集的操作就是对原集合对应的操作
         */
        System.out.println(list);
        /*
            将集合list中1-8这几个元素删除
         */
        list.subList(1,9).clear();

        System.out.println(list);//[0,9]
    }
}






